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Synchronizer Design: A Mathematical and Dimensional Treatise
Technical Paper
2004-01-1230
ISSN: 0148-7191, e-ISSN: 2688-3627
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Language:
English
Abstract
1.0
The manual transmission synchronizer design has been a real challenge and is usually referred to as a myth and black magic. A mathematical algorithm and dimensioning and tolerancing scheme has been developed to dispel this myth.
A unique and logical user-friendly method for designing synchronizer is devised. The knowledge that existed in the public domain is advanced to higher level to show that the design and calculations of physical parameters must go hand in hand.
The paper attempts to demonstrate the fact that the calculations of synchronizer physical parameters should be supported by scrupulously dimensioning and tolerancing the components design to achieve the intended functional objective.
A mathematical algorithm is developed which facilitates establishing the sleeve and blocker ring pointing angle relationship with the synchronizer size, coefficient of friction, cone torque, and index torque. The relationship is presented graphically in a unique manner identifying the clash and hard shift zones. As such, it allows sizing the synchronizer and selection of the parameters for a given application for comfortable shiftability between the two extremes of clash and hard shift.
Synchronization episode is separated in to the following six distinct events:
- Event IStrut contacts blocker ring
- Event IIEnd of strut loading, strut out of detent
- Event IIISleeve point hits ring point, ring clocked
- Event IVSleeve chamfer passes through ring chamfer
- Event VSleeve tooth point contacts clutching tooth point
- Event VISleeve tooth chamfer passes through gear clutching tooth chamfer
Arithmetic stack and calculations are utilized to iteratively dimension and tolerance the components for each event so functional harmony is achieved in concert with the selected physical parameters. Event charts are presented with illustrations and necessary stack for dimensioning and tolerancing the synchronizer components. The components that play significant role in each event are identified and related to specific physical parameter.
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Authors
Citation
Razzacki, S., "Synchronizer Design: A Mathematical and Dimensional Treatise," SAE Technical Paper 2004-01-1230, 2004, https://doi.org/10.4271/2004-01-1230.Also In
SAE 2004 Transactions Journal of Passenger Cars: Mechanical Systems
Number: V113-6; Published: 2005-07-05
Number: V113-6; Published: 2005-07-05
References
- Socin Richard J. Walters L. Kirk “Manual Transmission Synchronizers” SAE paper # 680008
- AE-15 Gear Design, Manufacturing and Inspection Manual SAE International